Nomenclature Of Organic Compounds

The given compound has the structure where the main chain is a pentyne (5 carbon atoms with a triple bond between carbons 1 and 2), and the side chain is a methyl group at carbon 3. Therefore, the IUPAC name is 3-Methyl-1-Pentyne.

The correct IUPAC name is 2-chloro pentene-3 because the double bond starts at the second carbon atom, and the chlorine atom is attached to the second carbon of the chain.

To name the compound CH₃-CH₂-CO-CH₃ using IUPAC nomenclature, we proceed as follows:

1. Identify the functional group: The C=O group indicates a ketone, so the suffix is “-one.”
2. Determine the longest carbon chain including the carbonyl group:
3. Number the carbon chain to give the carbonyl carbon the lowest possible number:
4. Choose the lower number: Carbonyl at position 2.
5. Name the compound: Butan-2-one (4 carbons, ketone at position 2).
6. Match with options: Butan-2-one corresponds to option (A).

Thus, the correct answer is: